1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 63407d264885..9cb65b0e7597 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -34,6 +34,9 @@ ACPI_MODULE_NAME("acpi_lpss");
 
 /* Offsets relative to LPSS_PRIVATE_OFFSET */
 #define LPSS_CLK_DIVIDER_DEF_MASK       (BIT(1) | BIT(16))
+#define LPSS_RESETS                     0x04
+#define LPSS_RESETS_RESET_FUNC          BIT(0)
+#define LPSS_RESETS_RESET_APB           BIT(1)
 #define LPSS_GENERAL                    0x08
 #define LPSS_GENERAL_LTR_MODE_SW        BIT(2)
 #define LPSS_GENERAL_UART_RTS_OVRD      BIT(3)
@@ -99,6 +102,17 @@ static void lpss_uart_setup(struct lpss_private_data *pdata)
         writel(reg | LPSS_GENERAL_UART_RTS_OVRD, pdata->mmio_base + offset);
 }
 
+static void lpss_i2c_setup(struct lpss_private_data *pdata)
+{
+        unsigned int offset;
+        u32 val;
+
+        offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
+        val = readl(pdata->mmio_base + offset);
+        val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
+        writel(val, pdata->mmio_base + offset);
+}
+
 static struct lpss_device_desc lpt_dev_desc = {
         .clk_required = true,
         .prv_offset = 0x800,
@@ -171,6 +185,7 @@ static struct lpss_device_desc byt_i2c_dev_desc = {
         .prv_offset = 0x800,
         .save_ctx = true,
         .shared_clock = &i2c_clock,
+        .setup = lpss_i2c_setup,
 };
 
 #else